Hi,
I am not sure if you mix things here…
A subdomain is part of a DNS database which contains hosts (ie host1.mail.example.com, host2.exeample.com).
You can redirect hostnames.
You can redirect URLs.
All three does not necessarily interact with each other.
Am I right you want people trying to access http://mail.example.com being redirected to http://mail.example.com/horde/login.php, correct?
And your hat already setup mail.example.com (meaning the hostname properly resolves to the correct IP)?
I will just tell you the predefined possibilities UCS offers, decide on your own which one to use:
- Starting Page
You can redirect the starting page ie. to the Horde login page by using the ucr variable. Check here. - Portal Entry
You can add an entry for Horde on the Portal landing page of Univention. Check docs. - Add Apache Virtual Host with a redirected hostname (CNAME)
You can add another virtual host to Apache. Adopt the hints from here for your needs and configure your hostname “mail.example.com” to point to your Horde host.
Hope it helps
/CV